The temperature at which air reaches water vapor saturation. Dewpoint is constant for a specific amount of water in a specific amount of air while relative humidity varies with temperature. The latest ASHRAE spec for data center environmental conditions includes an upper limit for humidity based on dewpoint.
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Leave a Comment (0) →The difference in temperature across a device. Examples include the temperature difference between the inlet and outlet of piece of IT equipment or between the inlet and outlet of a cooling unit (CRAC or CRAH). Delta T, airflow and thermal dissipation are related: thermal dissipation = airflow x delta T x specific heat of air.
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Leave a Comment (0) →Data Center Ready Solution
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Leave a Comment (0) →Data Center Infrastructure Management. as the integration of information technology(IT) and facility management disciplines to centralize monitoring, management and intelligent capacity planning of a data center’۪s critical systems. Achieved through the implementation of specialized software, hardware and sensors, DCIM will enable a common, real-time monitoring and management platform for all interdependent systems across IT and facility infrastructures.
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Leave a Comment (0) →A metric developed by the Green Grid, data center infrastructure efficiency is an efficiency measure that is calculated by dividing the IT equipment power consumption by the power consumption of the entire data center. This measure is the inverse of PUE.
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Leave a Comment (0) →An open area in a raised floor that allows airflow or cable feeds.
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Leave a Comment (0) →A device used to transform electrical current from one level to another with a specific ratio. For example, a 5000:5 current transformer transforms current on the primary side to current on the secondary side with a ratio of 1000:1. CTs are typically used to transform large currents to much smaller currents so that standard metering equipment can be used on a variety of circuits by measuring the secondary current rather than the large primary current.
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Leave a Comment (0) →A unit of flow rate, commonly used to specify airflow.
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Leave a Comment (0) →Computer equipment whose uptime is critical, typically supported by a UPS.
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Leave a Comment (0) →A device which cools water via the direct evaporation of some of the water. Water is pumped into the top of the cooling tower and allowed to run down over the fill, typically pads or strips into a sump at the bottom of the cooling tower. Air is drawn in from the sides over the fill by fans in the top of the tower, evaporating some of the water which cools the remaining water. The temperature of the water in the sump is controlled by varying the speed of the fans. The water in the sump is then used to cool the condensing section of a chiller or to cool the secondary loop directly via a heat exchanger (see water side economizer).
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Leave a Comment (0) →Using some type of physical barrier between a hot or cold aisle, for example, long plastic curtains or rigid plastic. Keeping warm exhaust air away from the intake of the server racks is a crucial part of making any data center more efficient.
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Leave a Comment (0) →Data center container is a self contained module often produced inside a custom built shipping container, that includes a series of rack-mounted servers along, its own lighting, air conditioning/de-humidification and Uninterruptable Power Supply (UPS).
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Leave a Comment (0) →Pronounced craw or cray, which uses chilled water passing through a heat exchanger to cool air flowing over the heat exchanger.
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Leave a Comment (0) →Pronounced crack, which uses refrigerant and a compressor. Cooling of the air in the data center is accomplished by airflow over the evaporation coils where the refrigerant is being “directly expanded”+A19.
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Leave a Comment (0) →A numerical analysis technique commonly used in the analysis of airflow in data centers.
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Leave a Comment (0) →Quantifies the amount of hot air mixing with cold inlet air prior to entering the rack.
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Leave a Comment (0) →An area where ambient air temperature is below desired levels. Typically caused by ineffective airflow management necessitating a temperature set point lower than that which would be required with proper airflow management.
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Leave a Comment (0) →Cold Aisle Containment system that directs cooled air from air conditioning equipment to the inlet side of racks in a highly efficient manner.
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Leave a Comment (0) →An aisle where rack fronts face into the aisle. Chilled airflow is directed into this aisle so that it can then enter the fronts of the racks in a highly efficient manner.
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Leave a Comment (0) →Used to rate the effectiveness of heat pumps or cooling units. It is the ratio of the load on a cooling unit and the energy that it uses.
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